Weil-McLain RS Burner specifications and settings, Burner data - Natural gas - Modulating

Weil-McLain 88 Water and Steam Boilers — Series 2 — For Gas, Light Oil, & Gas/Light Oil-Fired Burners

Burner specifications and settings

Table 1	Burner data — Natural gas — Modulating
Boiler	Burner	Pressure	Manifold	Gas Pressure Required at		Gas Pilot	Combustion		Combustion				Servo Motor Cam
Model	Model	Drop Thru	Pressure	Gas Control Inlet		Pressure	Head		Air Settings				Position Settings
Number	Number	Gas Train .					Setting
				Min	Max
		Inches W.C.	Inches W.C.	Inches W.C	Inches W.C	Inches W.C.
488R	RS28/M	0.75	3.30	4.05	14	5.00	3	27		52	0	22	90	—	—	—
488	RS28/M	0.75	3.60	4.30	14	5.00	4	27		52	0	22	90	—	—	—
588	RS38/M	1.30	3.70	5.00	14	5.00	2	17		70	0	25	90	—	—	—
688	RS50/M	1.83	2.90	4.73	14	2.70	3	16		65	0	18	90	—	—	—
788	RS50/M	2.40	3.50	5.85	14	2.50	4	28		85	0	20	90	—	—	—
888	RS70/M	2.98	3.70	6.63	14	8.25	3	2.5		7.0	—	—	—	130	0	35
988R	RS70/M	3.16	3.87	7.03	14	8.25	4	2.5		7.5	—	—	—	130	0	35
988	RS70/M	3.16	4.10	7.28	14	8.25	5	2.5		7.5	—	—	—	130	0	35
1088R	RS70/M	3.00	4.65	7.65	14	6.50	8	3.0		8.5	—	—	—	130	0	40
1088	RS70/M	3.00	4.90	7.90	14	6.50	9	3.0		8.5	—	—	—	130	0	40
1188	RS100/M	3.80	3.10	6.90	14	6.50	4	2.5		6.0	—	—	—	130	0	35
1288	RS100/M	3.82	3.63	7.45	14	7.50	4	3.0		6.5	—	—	—	130	0	35
1388	RS100/M	2.41	4.50	6.91	14	7.60	3	2.5		9.0	—	—	—	130	0	30
1488	RS130/M	3.76	3.30	7.01	14	7.80	5	2.0		7.0	—	—	—	130	0	50
1588	RS130/M	4.09	3.50	7.59	14	7.20	7	2.5		7.0	—	—	—	130	0	50
1688R	RS130/M	3.19	3.45	6.64	14	7.20	8	2.5		8.5	—	—	—	130	0	30
1688	RS130/M	3.19	3.70	6.89	14	7.20	9	2.5		8.5	—	—	—	130	0	30
1788	RS130/M	3.70	4.80	8.50	14	7.20	9	2.5		9.0	—	—	—	130	0	55
1888	RS190/M	3.71	3.50	7.21	14	5.00	0	0.5		3.8	—	—	—	130	0	45

Notes for Table 1, Table 2 and Table 3

1.Burner capacities listed for elevations up to 2,000 feet. For higher eleva- tions, consult local Weil-McLain distributor/agent or sales office.

2.Gas ratings based on natural gas with heating value of 1,000 Btu per cubic foot and specific gravity of 0.60. Gas burners for other gases are available. Consult local Weil-McLain distributor/agent or sales office.

3.Boiler-burner unit to be adjusted to achieve +0.10 inches W.C. pressure at the flue collar, resulting in positive pressure in firebox as listed.

4.Minimum gas pressures listed are subject to variations due to job condi- tions. Gas burners for other gas pressures are available. Consult local Weil-McLain distributor/agent or sales office.

5.All settings and pressures shown are for initial start-up. Final values should be confirmed with combustion analysis.

6.Gas train sizes for models 488R to 1288 are based on a supply pressure to the regulator of 7 inches W.C. Gas train sizes for models 1388 to 1888 are based on a supply pressure to the regulator of 12 inches W.C. Optional trains are available for other pressures upon request.

7.Gas Control Systems:

•OO: On - Off operation. Single-position air damper

•LHL: Low-high-low-off firing conditions – two-position air and fuel controlled by separate motor, open damper pre-purge.

•MOD: On - Off operation with proven low fire start and full modulating firing conditions. Proportional motor drives fuel metering valve and combustion air damper according to firing conditions; open damper pre-purge.

8.120/60/1 control circuit is used for all burners. Control circuit trans- former is available as an option.

9.Airflow safety switch is standard for all gas and combination gas/light oil units.

10.Burners will be completely assembled and wired (except gas train) and factory test-fired. Burners listed by Underwriters Laboratories, Inc., state of Connecticut, Fire Marshal state of Massachusetts, city of New York MEA, and others.

11.Special controls can be provided to meet other code requirements not listed. Consult your local Weil-McLain distributor/agent or sales office. Electric gas pilot will be furnished as standard equipment on all gas and combination gas/light oil units.

12.Direct spark ignition is standard for light oil units. Direct spark ignition is available as an option for combination gas/light oil units. Consult your local Weil-McLain distributor/agent or sales office.

13.All 3 phase models require a separate 120/60/1 control voltage supply.

14.Combustion Controls:

•Siemens LFL 1.335 flame safeguard control monitors the oil or gas burner flame with visual diagnostic window, provides pre-purge and post purge, provides switching necessary to allow firing rate motor to be driven to both low fire and high fire positions, prevent start up if pre-ignition interlocks are open and has low fire start proven circuit. In the event pre-ignition interlock circuit or running interlock circuit does not “prove”, system will lock out on safety. Ultra violet sensitive electronic flame detector is standard.

15.All units require a single SPDT controller for LHL firing rate opera- tion.

16.Modulating units 488R to 788 require a 120v bumping type signal or PID control for modulation.

17.Modulating units 888 to 1888 require a 4 – 20mA, 0 – 10vdc or 135 ohm signal for modulation.

18.Motor relay or contractor will be furnished on all units.

2 Part No. 550-142-025/0508